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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc19bb9d5820d07deae7914adbc8fa33301b910dbf76dcbe7716b4363f25f62d' 
  AND token = 'atmc9vVoWsmL99NmknwvbGsUsgs7a2tIEgMBKehMw6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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