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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564d8207d53faf2252bf951018867d265804a67c62038a540cbed0192ef8876d' 
  AND token = '5lyo+atcqCtY9cU53lkuWgJkQ4ZcNuovs2i9D+Y3ZPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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