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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e986db6f080365c27ec56abaafc6266bef9d819238c217b97abcbe82d311924a' 
  AND token = 'Kw8/DRIdxDamuokz3Tum3u3r3vSOZLm0Jo116/zA3pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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