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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1fda15ff884f5e4a421f2b1f2ea2704a76172aba7838729ba4ded5b69bf9af' 
  AND token = '8vKEvzl3FPQs+517Brt50d4lgLPLJPSiri8D4Adgulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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