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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6a8cb9d6392525217ec5259fd66ff3b50c4fe057cc70876be4bac724866f33' 
  AND token = '6LRjgH4z6knY4Hy8n0W1OwUJbne4pm7z5yPhB45SpzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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