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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b94d9eb7e462d14aa4c2c68c0cf97fbf44fd45745a51ed005f591661f7868a7' 
  AND token = 'rs0kz27I91J+aYy6J9dFF0gdn9OLcw2pv4F4Vsnujtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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