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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa95ba2506b74453b2e602f86f0eef6fa7c8f3fb1687bd0ad150943fbe8ee9b' 
  AND token = 'f34EpqXL5v6QP6DcSIv0nJ7pZnE8JRUa2TCeGqdQM58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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