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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46eed5d239f884995cac8fd3e7d7666369158f44c959001bc28f8d050244aac9' 
  AND token = 'oD4hBwUdpvbJpyhNq1n01mlYLu6AomW6izPFWNZ03Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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