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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5bb1d9cb7cc6735d80a9d33204d908a5c188d0222bd191b9894ef84c2abeaf' 
  AND token = 'UJY9qItlcix3bIqeXWQewkdCgbQooBQP+Tu6ZXkktXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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