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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda367db833665cf13ad40615c81da299b469931e9ab2778d847a916f698e669' 
  AND token = 'M7eNdjcDQ92DaZ9jbSeIPLFxJG2LZ45wtpHuFPOhlKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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