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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973e15d74208593b2e8c35e11c922c854aee71587a80e490f5da5c3e435fe9f8' 
  AND token = '48cjajRfSmVSUyHZN8PoMk8o7M0hz+eOJ/X1nk0WtPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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