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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edc3996fbe611ebdc0df8a862f9a02469f70e243d1e74eca5e8d609148a5dbb' 
  AND token = '0jHom5vAXtSTyOTWdvju/gy9+Umcc9kK8REFCbRCdEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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