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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6be91fe70e940d323774732ff46c1926e72f9c355111a342aa5b9e427bcad1' 
  AND token = 'ZA/mYoLT+T1u/dFdrRMpB9l/HJH1pF++yywQZR6jtnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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