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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396114d10f594c47bcb3c4807bff699591fc6674797414985e12a2ae3eb2f275' 
  AND token = 'uAM6rI3WQm/2Sduw0s87J9XYwIP/g1N3XL3HnZkcFvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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