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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c372d17fc43be317b840b0ab383451ec6a2d3a11296f28fdcd46d3ebd8c37e08' 
  AND token = 'RAGP30ERdeZ3gvOXQMkVev4FPP4OCHPLduqBLsTWrJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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