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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a2ef13080b922e532ce9599ba5ca0bd8cc4d4d97ae0135e37ef538200a5159' 
  AND token = 'D9FRZz3qnR4pJRch/Hyozu3i2hRxFIoocPK58nlwqVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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