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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a4cd076f9c024eee19a39ad98dc780ac1f0ec9d75ad2c6b478981f45dd4087' 
  AND token = '5FSFn6C9HerA76P1giDvA4mV7MGrZaSDZ83Vkx+Q/q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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