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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8301abf954b2d97d33639bd1106646cbfd83aa154a0370999f45181a356372' 
  AND token = 'HhESnunvcWIA4Xakzue8iQAbKvat5jAhPARnQ8PoU3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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