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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692b6b504fa30619dc315fe95ccc091ef27d58a9c6579db9ae98b8a15cad86d9' 
  AND token = '1YgJJk/iXhmZJ7ff6aqgZtkeuBmN1rV/rwMh+fLM0uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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