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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6086fba8ba70360119cd2679d331824dabcf68688820825395be060fa4cebfcf' 
  AND token = 'y++kbdLqQG+3C1II5gcMY78TKhDZ9m2eyVPppZUWNwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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