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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb40b2507824c39b9ffe74debd5e90c61857e3179a69fbf3c9805df7080dd1c' 
  AND token = '77A2BfVsmKCV8CqFWNlssbjdvy3ksdHVOM8Fb0pjnHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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