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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130d08e61cfe15ad61693ec6e00900a7b5ad4c0982b57ca478388c72256145e4' 
  AND token = '0nb3aSuGEUXOVcHyODXVo3hVorbxw5Bbz4McSbO8KwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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