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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba9dadd2b2e2dd391cfb8f02155741a087ce5a0ebc1ea29ffa73886e93c2ae5' 
  AND token = 'zkbsQkh53ysjUBbPVkVh/TU6/6c/ekcl1TvAIV6VpcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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