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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914bbfb760516925a11de488530e1e10c0506868e0501d8c2c14729bee58ffb5' 
  AND token = '0qihgHGzjLGC7thnEd7Vv7tLxPXouQj3xnCdcvtBjVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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