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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038d6b611c944fd337bd464455678007c79c633c31c9141c4710de7885b9c5a6' 
  AND token = 'dkmLJtcuDrhzOJf1cQX2kcGI49hMimnRLvrKNo+dC7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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