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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e61f069fa5939889dc67349e610de49d54bb91ffb03813eaebb5aef8fd06da' 
  AND token = 'H2dBya1eD57ikJo5NiLUb9AL3GXztyPQ/9ZE/EoC6zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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