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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1c182f3847ea8f6e55874c03dcb5a4d8c8628b21b7b56596e16ca670507c0a' 
  AND token = 'BwK8D6HBwmg7PNWH7qo76WtLIAf5ixt33zHMjx8hubg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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