SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d20eeff52aa2f8797585b4fac6d60fe8f900d878bd36f02696c67478162f682' 
  AND token = '4ojKi4WKhjliAuvcYYyEXU/H1Ro+cwzJi6XqVZynfSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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