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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce93cd1a142b4691de3de1b3859947c470c686cdaa622118259babe05d19a1d' 
  AND token = 'dLCTtlg9AhkM5MQfFPvvnwAwkBUzxld42tfm0lCawII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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