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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4539df17bec462c7591ab9b513bddc3541e03fc40cbc69a3c0ff51a6b912c8' 
  AND token = 'QfDAMjtSZRjloTlIl2I8CnKpahy5zt8h1LPnFrna8i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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