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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ade161e19e40eb4a86ef6078fc609e43df7556c74771a9fa5ebc6303e7ebe00' 
  AND token = 'PsSc82Wy0CNAZ8u9ClcTv97N2mCW7mCD2zs4VnEgNew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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