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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e883c66bebffbc508ba8811853b2f711885d5670e65c5e728ec27da787470334' 
  AND token = '7g+QVzZ3YP+x6P375dkQCrycI5ZwOQa43nURK8D5TFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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