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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038e3ffdc9eb1313cf8b9771cd721cf878877d48dc8380907dcbcddda9d104f8' 
  AND token = '/rz83uGbEyc4bFHkYbGN06J2tQZlHR1Lif8adjwzqis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00205

JSON explain

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