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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0e57fc5bc5e1edc8d4111b4e1a866aa0abad4db47188bce1d74619a8d9c915' 
  AND token = 'hd+/leZuECy13nYmsNklAuk4PoxdXs19BaP1siGNfE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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