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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db31f94b3169dc14e7c6b2e59e99e30a8abbb8afa0a345d9c95191155eeee0e7' 
  AND token = 'cWcyt513Ad9EFVKgr0ZKY+1oZ2CBB/Y7RtKNms2sWis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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