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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1df32a5c58633e1600b31667597402610bce1615b608b0c0ba4f38050cbc3b' 
  AND token = 'MvP7SkJWcikPw5x/vV7qR4/VNuvu5djRkLQSp8pf46c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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