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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84e3a80ef06d40842b9c8c65057a0874bdc145aaae09309125d98c23422985b' 
  AND token = 'OvliK0cS6dnRWMaFztyE495sv8uaIu+8C2OGDTkOysU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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