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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3c822cc18780aeee0a2ed21507d461eed98efb30925b192b3e0066bf8524c0' 
  AND token = 'FGzLxan6gVoLzgc7kPiYE1Rm+PBwTF/rwlZonbrJwFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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