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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc7e4f2188ebfa6eb5ea4f4ca404911ebe1b2dff36603c8822b3fbf99549172' 
  AND token = 'TA3RZvRRDSSnBZK9lTjjutp3Ux9D9C3Yq+FkJN6X7uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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