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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d274a5811b0fae1704f27634d2cda9dc8147da6db3338521b9967926668590' 
  AND token = 'Rv4u+ybgdPWnbl5cchIaoZFlds8yiFQKMix3SLhoM8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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