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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a987f8d88a31aad768adff4de6a440d5e00a8857c5e79d73312554ea7b4fedcf' 
  AND token = 'emQGtXICC45zgC5XW89NuLdMdBuD9pj3j381QGCH0KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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