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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7941189a1fba70cc25429eb9f96e493bccff5bfec02f15c5b63e96e883ed41fe' 
  AND token = 'psNF6y3URIEc6WJSOOd1hqU6fGex6/RHMVK5ssEuaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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