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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec94b92ec851ca5aa4fc0bd07162bc60c4ed2a468971614882cc3b06cd1a3fb' 
  AND token = 'yGuXLuIjqnGjoZ+QfGCyDryPuocBu2dAjutJ2f27MOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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