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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029f2deb9bb348726e1eb3e27497c234bb3f24bfec350059d562ef71b1cbdd99' 
  AND token = '1e18klDLkH9kZfe7Kjic7YIIBN37tZ+0mduqWF54DrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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