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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc64447beaadd89a9cbfd536fd009f7228135b3eb6a413cb2a7ddf11a3d9b9a9' 
  AND token = 'VvgaNSKtWZaBAUwUH8t6EtjNw5a39N/l/mc/ivHfDXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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