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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24bb02205c25aaa3f1ae65f110e6b1532ac85de9b449ab54fb2aec0c4060421' 
  AND token = 'CM89Jk8qTpHhvCtWMcCtZazynHv8ODxcbCuYyo90GFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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