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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce346ba95279620294d52a45d93801633929541984c9036e2111cc31f884a1b9' 
  AND token = 'dRjyxVzB8FMCKdf2qnnp5Pr8Q52m2sLIg2aZ0ICu4Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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