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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14aae2b7f9ec88189dc81ccfdace5481dbdc3ebb3a19e39744d7c7b3fb0495d5' 
  AND token = 'St8zAq4L67oN2jlEUi3TzT7aoKEKSKJKUP8f9yjsv54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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