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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a76e829ec8bf26e2787f606d9e33c2a26ea4a806b056a4ab5c6d253bf220b09' 
  AND token = 'Qz3FhKcybY02JR/BtjQytgYWnAmfQYe5XNVa3WaCRRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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