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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ef1e8f1d6367bf85668cd28be8e3aa000ebe162f5f9c13a642bfddef3cf1d5' 
  AND token = '8UY47h1uvLY/bMVwx87Snhrv5dTrl4Q/S3gtCXrY6m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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