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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938e376039f107b7e7da0e22ae074f1fc717062250a217658a5188778cd31d68' 
  AND token = '8ok0+uRNw6QiJ7r6+ZB/hizq5ynM6qgwdlJKLU9Ocgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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