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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd3a7bd30e797d8129d0ce14d4a00f562d761ead52093e18ed14ed111968132' 
  AND token = 'MvS+OCvTbbQp4Jv7P8ViepXLn9jc4VlusiZQIzxPenE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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