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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f771e07a370125cb6ac7a0506831985f42d15c2fa5c15122743c6b6b096feea' 
  AND token = 'H88uLnCtw5driWMCfGBd9bxzbf+I4Roafq7WxcpWZW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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