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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7c762884c8aa4dfd8a1e823fb1a22fcdf7621caa79bb17d34f1e3dcfe66090' 
  AND token = 'yCO/mhtWg0ddrord4aCxlPg+gUoZCIv45/nHL/MOVco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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