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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff297d6aeed30a567adb5968cd17a66c0ce053a1742dc5e79347adff1413d78b' 
  AND token = 'xe2zzV9A6XTqDucpNopFuuBu8z2ROKV2I3wCRjkoUxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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