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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754569e4c4989cd5b410a15015fad1177d82b9150ddb2c7a3c5048526463241b' 
  AND token = 'qQBH9JNYnPRockzlt7w0M0ImLRxkjZj809wkcTIH5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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