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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8a53157c17f89e5455335869930fac4713498d4c469be5e8853f72a85d0364' 
  AND token = 'mM0RlmvxaIl6GkRaOwsp7vuiUJDN1/sbSTvcy9yQPoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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