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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60142499df90b01b7abeb7a335b57bd96b1187bfa8bcd4ffd753d9a3410e9f3a' 
  AND token = 'ZBqTBdgGxLw3IDtQXCgtc3YTI8tFIe2yfeRBL9M7IGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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