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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1133c4595f9906748c9cc0556bb981aecf922b6a680338af79d74ceab87360' 
  AND token = 'rWhvAB2qKdgnD5/Inna4dVPvKT8Cx3m8YQRIE3Cabw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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