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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7932c9909a273318f44cdf567e1d18634a589a2c59b996e98d40f5c3400565a' 
  AND token = '5vt89qBaDhw8EUwUoKuhNbzZWol9keSK/J35Fkb1+Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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