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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c016d4657548f6349d57cbe5567ab1e88950c2402c65fcf102eb05d4ceb6acd' 
  AND token = 'ixuhSwPlih+RkSdUM+5m7DJDyYXdKfKiVABxOtimU1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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