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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc1fd7ead568158a0fb5307e43b1ce72b35f64ca35c501c954b7e237523ea32' 
  AND token = 'G9XWUCB/m2CTphTTGeXPK1d0R38E3BNqDWZ5AMp/3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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