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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b1ff7fc282a27a78cc66c87b2d2bfa11ce708e986e1c58543fdcc48ec568c3' 
  AND token = 'kHAl+PdZP9p7vUVirzcPDS9h1pyMlgUwaV9/HlPGd7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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