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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bc582934a31f134f7a6ae003319ec5e15406a7ff2f6978c90da1e3c0e24211' 
  AND token = 'y8ovxV845uOk4IuH+rzNTkqddKUZGJWpiM4zwtdeE0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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