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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5610e4b0c3d080539aaae988891aa22d8099154526ad73c9c2c16ec6eb1ba054' 
  AND token = 'ZcHdlKORGd+MHUKvUnItUA/NeJhP6knS2fYU5qRsTKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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