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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2aab201f52981f4bcdb52ea09cae9ae097416649f4300335eca4792dee6cb4b' 
  AND token = 'jVTKBeiK7l6pHJlxs8L2fwWedUJDxa2sCZHNm9f4z1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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