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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68704297826911de10e03eaa98be3cd1cf15f9e031493ab5d660c9fbbea37d60' 
  AND token = 'q+SNNf/Kp0F66K2LD+DGk2Kn2Am3guGyQ2SwkYyitkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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