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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce50bf6dadad0ada34beca0c9871888f43d57505149904256ff4d05a46830954' 
  AND token = '/g27Z3Mgqil2yGpr6G7XL866f5cub1I03wrkXKljYrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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