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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efb1a085087db6115f2ae2a0a31d07d6ee6994d0a7ef54981901bb16a7191e7' 
  AND token = '/AjSKhYaEhAEqsxwrRKMgG3SwBA491+LaYWtRuPDzh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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