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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c585c12499189dc7180465053932d7af9a9da533657c2dddb94cc731259ca0' 
  AND token = '3HfdYBu0lrM1Cwmoq78MG1iEVUAFAFwcQVASlbPy7RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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