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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4a523e649cda18a025e8ef20e1c1ff2e5bdb09b9c9d5dfb2204a2eaeb3db2b' 
  AND token = '/RA8kTRyU8DeMVyGvXZH8/mJsjt77AxnlR5ATSXsNhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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