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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674e87203d0232a1f6568c6e5c5d487ce5ee70f2436451bbb68e38737c6f4bf8' 
  AND token = 'fcmrTjgJi4q2ByGmtUES02Nn+b0FAO6gE5TWQaXtU+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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