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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a682f419ee71742264e6fbc042c3bc9c02dfca827611b570cc16505ec824e75' 
  AND token = '6Z4mFR+phh8nMk1m47GAWCzSzCK29lpxLq8N4sNj8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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