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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed884b9ed89e23e301aae9df2fd5aeb34a24d09c7b3136ada96265e3b0a231' 
  AND token = 'XyULtG+T4vJrSTmvhlO+F0b2Of7IT4kCc7XJv5n4LpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}