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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e786d0b2f869ca7957678fb8a3e11af72fe355dc0904917351cb68b642cea10' 
  AND token = 'g1KGVhyOouInVEoeF77t+20AQr2hEE/BnaZzSUKko1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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