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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db47f7858089069e3b94a27920fcc33c897d067bd4aa65b36d88adc5eb65c579' 
  AND token = '/zhYoMSxD5wn2V4DYy5qgayT2K386D0J/SXzPIdBmys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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